ИСТИНА

Nanocomposites are the materials that consist of a plastic polymer base (matrix) and a nanocomponent. Nanocomposites are called materials of the future, since they have new, extremely valuable and needful properties that differ from the properties of the base substances. For example, there are sensors operating on the basis of the giant Raman scattering effect are required in chemical analysis, biology, medicine, pharmaceuticals, ecology and judicial practice. The production of these sensors is possible from inverted silver opals, so that is why the selection of a simple and inexpensive method of the synthesis of this nanocomposite material seems relevant. The purpose of this work is the comparison of the possibilities of synthesis of inverted silver opals by impregnation and electrochemical methods. The scientific literature describes the method of synthesis of inverted silver opals by electrochemical deposition[], meanwhile, the impregnation method is easy to use, technologically advanced and can easily be churned out. It seems interesting to compare the possibility of synthesis of inverted silver opals by impregnation and electrochemical methods, which is the main goal of this work. To achieve this goal, samples of inverted silver opals were synthesized by the two aforementioned methods and their optical properties were studied. Polystyrene microspheres with a diameter of 440 ± 20 nm were used for the synthesis of the opal matrix. The diameter was determined by dynamic light scattering and confirmed by scanning electron microscopy. The optimal size of polystyrene microspheres and other conditions for obtaining an opal matrix were selected earlier. Slide glasses with a conductive layer (ITO) were used as substrates for the matrix. For the synthesis of inverted silver opals, the obtained opal matrices were divided into two batches. In the first batch, silver deposition on the opal matrix was performed by electrochemical method under previously selected conditions. In the second batch, silver deposition on the second batch of plates was carried out by the impregnation method. Analysis of the results showed that the electrochemical deposition method, in contrast to the impregnation method, allows to get the opal matrices with more complete filling of the voids and ensure the formation of an inverted opal structure with periodic surface relief. The impregnation method forms more uniform structures in thickness. The spectra of inverted silver opals obtained by electrochemical deposition contain clear extremes corresponding to localized surface plasmons and mixed-type plasmons. The spectra of inverted silver opals synthesized by impregnation have a more blurred contour of minima.